Bump coverage from 7.6.7 to 7.6.8

Bumps [coverage](https://github.com/nedbat/coveragepy) from 7.6.7 to 7.6.8.
- [Release notes](https://github.com/nedbat/coveragepy/releases)
- [Changelog](https://github.com/nedbat/coveragepy/blob/master/CHANGES.rst)
- [Commits](nedbat/coveragepy@7.6.7...7.6.8)

---
updated-dependencies:
- dependency-name: coverage
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -4,6 +4,6 @@ mypy==1.13.0
 pyre-check==0.9.23
 flake8==7.1.1
 black==24.10.0
-coverage==7.6.7
+coverage==7.6.8
 python-coveralls==2.9.3
 build==1.2.2.post1